\item\subquestionpoints{5}
\textbf{Semi-supervised E-Step.}
Clearly state which are all the latent variables that need to be re-estimated in the E-step. Derive the E-step to re-estimate all the stated latent variables. Your final E-step expression must only involve $x, z, \mu, \Sigma, \phi$ and universal constants.

\ifnum\solutions=1 {
  \input{04-semi_supervised_em/02-e-step-sol}
} \fi
